As most of you know, I am running an 8valve gear, no idler, i've only put a few 1000 km's on and no issues so far BUT now I am moving the distributor to the head, I no longer need to use the larger sprocket. I think the belt will be better off with the idler as I get a strange resonance at 2000 rpm and I think the idler will help. I know the TIII oil pump is over spun so I guess running the 8 valve sprocket helps with pump and gear life.
Opinions?